libjava/testsuite/libjava.lang/Class_1.java

   1 class C {}
   2 class D extends C implements I {}
   3 interface I {}
   4 interface J extends I {}
   5
   6 public class Class_1
   7 {
   8   static void printIsAssignableFrom(Class a, Class b, boolean c)
   9     {
  10       // The field 'c' can be viewed to see the expected value.
  11       System.out.println(a.isAssignableFrom(b));
  12     }
  13
  14   public static void main (String arg[])
  15   {
  16     System.out.println("Testing class `Class_1'...");
  17     printIsAssignableFrom(C.class, Object.class, false);
  18     printIsAssignableFrom(C.class, C.class, true);
  19     printIsAssignableFrom(C.class, D.class, true);
  20     printIsAssignableFrom(D.class, C.class, false);
  21
  22     printIsAssignableFrom(Object.class, int[].class, true);
  23     printIsAssignableFrom(int[].class, int[].class, true);
  24     printIsAssignableFrom(C[].class, D.class, false);
  25     printIsAssignableFrom(C[].class, D[].class, true);
  26     printIsAssignableFrom(C[].class, C[][].class, false);
  27
  28     printIsAssignableFrom(Object.class, I.class, true);
  29     printIsAssignableFrom(I.class, I.class, true);
  30     printIsAssignableFrom(D.class, I.class, false);
  31     printIsAssignableFrom(I.class, D.class, true);
  32
  33     printIsAssignableFrom(D.class, J.class, false);
  34     printIsAssignableFrom(J.class, D.class, false);
  35
  36     printIsAssignableFrom(I.class, J.class, true);
  37     printIsAssignableFrom(J.class, J.class, true);
  38     printIsAssignableFrom(J.class, I.class, false);
  39
  40     // Returns true iff both Class objects are equal.
  41     printIsAssignableFrom(long.class, long.class, true);
  42
  43     // Does not work for primitive types in general.
  44     printIsAssignableFrom(long.class, int.class, false);
  45   }
  46 }